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Since the first time DNA evidence helped overturn a conviction in 1989, more than 300 people have been cleared of crimes they did not commit with the help of such evidence. Here is a look at cases where DNA evidence has helped overturn convictions of those awaiting execution on Death Row.

The Numbers

301 - Post-conviction DNA exonerations in the U.S.

4,036 - Total number of years in prison served by people since exonerated through DNA

13.6 years - Average length of time served

18 - People exonerated through DNA who served time on Death Row

Nicholas Yarris

Where: Pennsylvania

Crime: Dec. 16, 1981, abduction and murder of 33-year-old woman

Convicted: 1982

Conviction based on: Eyewitness misidentification, informants

Exonerated: 2003

Years between: 21

Reason: Charges dismissed after DNA testing revealed body fluids found at the scene were not Yarris'